Lewis & Short

lūcĭdus, a, um, adj. [lux], containing light, full of light, clear, bright, shining (syn.: luminosus, luculentus; as an adj. not in Cic.).

  1. I. Lit.: aër, Lucr. 4, 315: sidera, Hor. C. 1, 3, 2: gemma, Ov. H. 15, 74: amnis, Quint. 12, 10, 60: concha, Tib. 2, 4, 30: lucidior domus, Ov. F. 1, 94: lucidissima stella, Vitr. 9, 6: saxa, Stat. S. 3, 3, 200 (Queck, dulcia): quid lucidius sole? Vulg. Sir. 17, 30.
    1. B. Transf., brilliant, bright, beautiful, transparent, shining, white, etc.: Alcyone, Ov. H. 19, 133: ovis, Tib. 2, 1, 62: sedes deorum, Hor. C. 3, 3, 33: vestis, Plin. 35, 9, 35, § 59 (better tralucido).
  2. II. Trop.
    1. A. Full of light, i. e. of truth and purity: totum corpus tuum lucidum erit, Vulg. Luc. 11, 34.
    2. B. Clear, perspicuous, luminous, lucid (of speech, or of orators; a favorite expression with Quintilian); neque refert, an pro lucida (narratione) perspicuam dicamus, Quint. 4, 2, 31: propositio aperta et lucida, id. 4, 5, 26: manifesta et lucida ratio, id. 4, 5, 3: ordo, Hor. A. P. 41.
      Comp.: res lucidior, Quint. 7, 3, 21: causa, id. 4, 4, 4; 4, 2, 83; 4, 5, 1; 2, 3, 8: lucidior via, id. 3, 11, 23.
      Transf., of orators, Quint. 12, 10, 21: lucidior auctor, id. 10, 1, 74.
      Hence, adv.: lūcĭdē.
    1. A. Clearly, plainly, distinctly (mostly of speech): lucide verbum definire, *Cic. de Or. 2, 25, 108: lucide dicentium, Quint. 8, 3, 1.
      Comp.: quo lucidius intellegi possit haec exceptio, Dig. 44, 4, 1.
      Sup.: sic ostendit lucidissime causam, Quint. 4, 5, 12.
    2. B. Gloriously (see lucidus, B.): lucidius tranquilliusque inter divina mansurus, Sen. Ep. 71, 16.